# Driver Transistors

* &#x20;IC104 controls ECU pin 14 ('90) or 6 ('91+), MAF Reset signal. The other half of the chip is unused on US DSMs.
* &#x20;IC105 controls ECU pins 67 and 68, Idle Speed Control (ISC) Servo (coil pair B).
* &#x20;IC106 controls ECU pin 57, Fuel Pressure Solenoid (FPS), and ECU pin 105, Boost Control Solenoid (BCS).
* &#x20;IC107 controls ECU pins 58 and 59, ISC Servo (coil pair A).
* &#x20;IC108 controls ECU pin 53, EGR Solenoid, and ECU pin 62, Evap Purge Solenoid.
* &#x20;IC109 controls ECU pin 56, Fuel Pump Relay, and ECU pin 65 Air Conditioner Compressor Clutch Relay.

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[https://www.ecmtuning.com/wiki/driver01](https://www.ecmtuning.com/wiki/driver01)
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